CC 2019-05-28_08e Monthly Water Supply and Demand Update
MEMORANDUM
TO: CITY COUNCIL
FROM: BILL ROBESON, PUBLIC WORKS DIRECTOR
BY: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: MAY 28, 2019
SUMMARY OF ACTION:
The update reports the water supply and demand for April 2019. Current Lopez Reservoir
level and projected levels are provided in the attachments.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
Approximately two (2) hours of staff time is required to prepare the report.
RECOMMENDATION:
It is recommended the City Council receive and file the monthly Water Supply and
Demand Report.
BACKGROUND:
On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water Shortage
Emergency along with related emergency water conservation measures and restrictions.
During the public hearing the City Council requested staff to continue preparing the
monthly water supply and demand updates. The Council urged citizens to continue to
practice every day water saving measures, and reiterated that the previously adopted
water saving measures were to remain in effect.
In April 2019, the City’s water use was 176.4 acre-feet with a per capita use of 109 gallons
per day/per person. There was a total of 0.35” of rainfall in April. The water use for the
current “rolling” water year from April 2018 to April 2019 was 2,136 acre-feet, which
equates to a per capita use of 108 gallons per day/per person. There was a total of 17.95”
of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of May 16, 2019 shows San Luis Obispo County
in a normal condition. Rainfall to date (July 1, 2018 to May 17, 2019) is 18.3 inches at
the Corporation Yard rain gauge. Lopez Lake, as of May 17, 2019 is at 59.4% capacity
(29,321 acre-feet of storage).
Item 8.e. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
MAY 28, 2019
PAGE 2
The new water year began on April 1, 2019 and the current total available supply from
Lopez is 2,290 acre-feet, our normal entitlement. In addition, we have 1,323 acre-feet of
ground water entitlement from the Santa Maria Basin and 200 acre-feet from the Pismo
Formation. In addition, we have 378 acre-feet of available surplus water from Lopez. The
projected water use for 2019/20 is 2,200 acre-feet. In conclusion, based on average
rainfall for the next two years, the current supply will meet the projected demand.
ADVANTAGES:
No advantages noted at this time.
DISADVANTAGES:
No disadvantages noted at this time.
ALTERNATIVES:
Not applicable at this time.
ENVIRONMENTAL REVIEW:
No environmental review is required for this item.
PUBLIC NOTIFICATION AND COMMENTS:
The Agenda was posted at City Hall and on the City’s website in accordance with
Government Code Section 54954.2.
Attachment:
1. Lopez Monthly Operations Report for April 2019
1a. Lopez Monthly Operations Report for March 2018
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
Item 8.e. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportApril, 20190.00Note: Deliveries are in acre feet. One acre foot = 325, 850 gallons or 43, 560 cubic feet. Safe yield is 8,730 acre feet."Year to Date" is January to present for State water, April to present for Lopez deliveries, and July to present for rainfall.169.75April to Present26.27Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)497.12Storage (full at 49200 acre feet)29366Rainfall0.16Downstream Release (4200 acre feet/year)173.39Spillage (acre feet)0This MonthYear to Date173.390.00378.00169.75Entl.SurplusUsage2668.00TotalLopez Water Deliveries33.79Oceano CSD30350.0033.79353.0064.13Grover Beach800132.0064.13932.0091.50Pismo Beach892147.0091.501039.004.41CSA 1224540.004.41285.00317.55112039.0023.98278.2010.982270.00State Water Deliveries363.584530747.00363.585277.00383.48150155.67Total ContractorDifference (feet)-25.25% Full59.7%Comments:Surplus water shown is pending BOS May 14, 2019 Declaration of Surplus Water.1) Oceano supplied State Water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 1.76 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 1.76 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200Jul '18 Aug'18Sep'18Oct'18Nov'18Dec'18Jan'19Feb'19Mar'19Apr'19Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080100120Jul'18Aug'18Sep'18Oct'18Nov'18Dec'18Jan'19Feb'19Mar'19Apr'19Acre FeetOCSDPBCSA12SanMigSan Miguelito30.971278.47This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request169.75Total Water Deliveries This Month33.7964.13130.512.618.47419.25Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.00169.7533.7964.1391.504.41363.580.00205.00SWP DeliveriesSWP DeliveriesChange in Storage1209.04This Month Stored State Water0.0%7.4%6.4%11.2%9.6%8.0%6.9%10.3%8.8%1.8%1.5%3.5%28.4%30.4%88.8%0.0%4.8%8.0%6.9%3.7%25.5%6.7%24.4%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%7.4%11.2%8.0%10.3%1.8%8.0%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%Last Month Stored State WaterFriday, May 3, 2019Page 1 of 1Report printed by:AdminData entered by: D.BravoATTACHMENT 1Item 8.e. - Page 3---.mu~ 1□ ■ □ □ ■ 1□ □ ■ □ l I I I
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Item 8.e. - Page 4
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161.2176.469109020406080100120140160180200Apr‐18 Apr‐19Monthly Water Use ComparisonAcre FeetUsage (gpcd)ATTACHMENT 3Item 8.e. - Page 6■ ■